Virtually all State Early Childhood Comprehensive System Initiatives have adopted or identified indicators for monitoring program performance and child outcomes related to early childhood systems. These are primarily based on nationally recommended indicators or on state initiatives. However, although a functional set of indicators is needed to monitor progress of ECCS initiatives across the states, there is no one overarching set of indicators consistently being used. The challenge for states' ECCS leadership is to select an indicator set that is both comprehensive enough to monitor system developments and specific and limited enough to be useful and manageable. This Short Take reviews the characteristics of good indicators and proposes 36 indicators, based on a review of the literature, an analysis of key national indicator sets, and a comparative review of indicators set out in State ECCS reports and plans.